1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
5 *
6 * strtok_r, from Berkeley strtok
7 * Oct 13, 1998 by Wes Peters <wes@softweyr.com>
8 *
9 * Copyright (c) 1988, 1993
10 *	The Regents of the University of California.  All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notices, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notices, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY SOFTWEYR LLC, THE REGENTS AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL SOFTWEYR LLC, THE
28 * REGENTS, OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
30 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)strtok.c	8.1 (Berkeley) 6/4/93";
39#endif /* LIBC_SCCS and not lint */
40#include <sys/cdefs.h>
41__FBSDID("$FreeBSD$");
42
43#include <stddef.h>
44#ifdef DEBUG_STRTOK
45#include <stdio.h>
46#endif
47#include <string.h>
48
49char	*__strtok_r(char *, const char *, char **);
50
51__weak_reference(__strtok_r, strtok_r);
52
53char *
54__strtok_r(char *s, const char *delim, char **last)
55{
56	char *spanp, *tok;
57	int c, sc;
58
59	if (s == NULL && (s = *last) == NULL)
60		return (NULL);
61
62	/*
63	 * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
64	 */
65cont:
66	c = *s++;
67	for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
68		if (c == sc)
69			goto cont;
70	}
71
72	if (c == 0) {		/* no non-delimiter characters */
73		*last = NULL;
74		return (NULL);
75	}
76	tok = s - 1;
77
78	/*
79	 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
80	 * Note that delim must have one NUL; we stop if we see that, too.
81	 */
82	for (;;) {
83		c = *s++;
84		spanp = (char *)delim;
85		do {
86			if ((sc = *spanp++) == c) {
87				if (c == 0)
88					s = NULL;
89				else
90					s[-1] = '\0';
91				*last = s;
92				return (tok);
93			}
94		} while (sc != 0);
95	}
96	/* NOTREACHED */
97}
98
99char *
100strtok(char *s, const char *delim)
101{
102	static char *last;
103
104	return (__strtok_r(s, delim, &last));
105}
106
107#ifdef DEBUG_STRTOK
108/*
109 * Test the tokenizer.
110 */
111int
112main(void)
113{
114	char blah[80], test[80];
115	char *brkb, *brkt, *phrase, *sep, *word;
116
117	sep = "\\/:;=-";
118	phrase = "foo";
119
120	printf("String tokenizer test:\n");
121	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
122	for (word = strtok(test, sep); word; word = strtok(NULL, sep))
123		printf("Next word is \"%s\".\n", word);
124	strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");
125
126	for (word = strtok_r(test, sep, &brkt); word;
127	    word = strtok_r(NULL, sep, &brkt)) {
128		strcpy(blah, "blah:blat:blab:blag");
129
130		for (phrase = strtok_r(blah, sep, &brkb); phrase;
131		    phrase = strtok_r(NULL, sep, &brkb))
132			printf("So far we're at %s:%s\n", word, phrase);
133	}
134
135	return (0);
136}
137
138#endif /* DEBUG_STRTOK */
139